package com.example.gsq.news.adapter;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;


public class DividerItemDecoration extends RecyclerView.ItemDecoration {

    public static final int HORIZONTAL = LinearLayoutManager.HORIZONTAL;
    public static final int VERTICAL = LinearLayoutManager.VERTICAL;
    public static final int GRID = 2;

    private static final int[] ATTRS = new int[]{android.R.attr.listDivider};

    private Drawable divider;

    private int orientation;

    public DividerItemDecoration(Context context, int orientation) {
        final TypedArray typedArray = context.obtainStyledAttributes(ATTRS);
        divider = typedArray.getDrawable(0);
        typedArray.recycle();
        this.orientation = orientation;
    }

    public void setOrientation(int orientation) {
        this.orientation = orientation;
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
        if (orientation == VERTICAL) {
            drawVertical(c, parent);
        } else if(orientation == HORIZONTAL) {
            drawHorizontal(c, parent);
        } else if(orientation == GRID) {
            drawGrid(c, parent);
        }
    }

    public void drawVertical(Canvas c, RecyclerView parent) {
        final int left = parent.getPaddingLeft();
        final int right = parent.getWidth() - parent.getPaddingRight();

        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount - 1; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
            final int top = child.getBottom() + params.bottomMargin;
            final int bottom = top + divider.getIntrinsicHeight();
            divider.setBounds(left, top, right, bottom);
            divider.draw(c);
        }
    }

    public void drawHorizontal(Canvas c, RecyclerView parent) {
        final int top = parent.getPaddingTop();
        final int bottom = parent.getHeight() - parent.getPaddingBottom();

        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
            final int left = child.getRight() + params.rightMargin;
            final int right = left + divider.getIntrinsicHeight();
            divider.setBounds(left, top, right, bottom);
            divider.draw(c);
        }
    }

    public void drawGrid(Canvas c, RecyclerView parent) {
        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
            final int top = child.getBottom() + params.bottomMargin;
            final int bottom = top + divider.getIntrinsicHeight();
            final int left = child.getRight() + params.rightMargin;
            final int right = left + divider.getIntrinsicHeight();
            divider.setBounds(left, top, right, bottom);
            divider.draw(c);
        }


    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        if (orientation == VERTICAL) {
            outRect.set(0, 0, 0, divider.getIntrinsicHeight());
        } else if(orientation == HORIZONTAL) {
            outRect.set(0, 0, divider.getIntrinsicWidth(), 0);
        } else if (orientation == GRID){
            outRect.set(0, 0, divider.getIntrinsicWidth(), divider.getIntrinsicWidth());
        }
    }
}
